Computing Algorithms for Sire Evaluation with All Lactation Records and Natural Service Sires

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Abstract
Models for cattle sire evaluation by best linear unbiased prediction procedures which consider all lactation records, an environmental correlation among paternal half-sisters in the same herd, herd-year-season effects, genetic groups and sires within groups are described. The computing algorithms are outlined briefly. Attention is drawn to a mimeographed publication which describes in detail the computing algorithms for a model including an interaction between sire and herd (the environmental correlation) and a model which does not include the environmental correlation.